Hacksaw



E. G. IRELAND AND J. D. CLARK.

HACKSAW. APPLICATION FILED NOV. I, 1920.

Patented Oct. 18, 1921.

5020/27 6. Ire/and,

Jahn I. czar/r- UNITED STATES PATENT OFFICE.

EDWIN G. IRELAND AM) Join: n. CLARK, or CLAYBURN, BRITISH COLUMBIA, CANADA.

HACKSAW.

T 0 all whom it may concern Be it known that we, EDWIN G. IRELAND and JOHN D. CLARK, citizens of the Dominion of Canada, residing at Clayburn, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Hacksaws, of which the following is a specification.

This invention relates to an improved hack-saw frame, the improvements being particularly directed to the manner of connecting the saw blade to the frame whereby the blade may be set to any desired angle in relation to the plane of the frame and is secured in such angular adjustment by the tension applied to the blade.

The invention is fully described in the following specification, reference being made to the drawings by which it is accompanied, in which: I

Figure 1 is a side elevation of the saw.

Fig. 2, an end elevation in the direction of the arrow 2, and

Figs. 3 and 4 are enlarged details of the manner of connecting the saw blade to the frame.

Figs. 5, 6 and 7 show a modification in the manner of adjustably connecting the saw to the frame.

In these drawings 2 represents the supporting frame of the saw, to one end of which a handle 3 is secured. At the same end as the handle is attached a portion 4 projects below the handle to receive the saw blade connection, and above the handle at 5 to receive the rod 6 by which the saw is tightened in the frame in the manner to be described later.

To the .outer end of the frame 2 a lever 8 is pivotally mounted at 7, the length of which lever corresponds to the distance be tween the saw connection 4 and the tightening rod connection 5 adjacent the handle. To the upper end of this lever 8 the tightening rod 6 is pin-connected at 9 and the other end of this rod is threaded where it passes through 5 to receive a wing nut 10.

The downwardly projecting end 4 of the frame 2 and the coresponding end 11 of the lever 8 are conically bored to receive correspondingly coned bushiings 12, which bushings are axially threaded to receive the stems 13 of jaw members 14 in which the ends of the saw 15 are connected by pins 16.

The end of each stem 13 where it passes Specification of Letters latent.

Application filed November 1, 1920.

Patented Oct. 18, 1921.

Serial No. 421,034.

through the bushing 12 is provided with a lock nut 17 by which it is secured against rotation.

The ends of the saw 15 being secured in the aw members 14 by the pins 16, the bushings 12 may be rotated in their supports 4 and 11 to set the plane of the saw blade to any desired angle in relation to that of the frame 2, and when the saw is drawn tight by means of the wing nut 10 on the end of the tightening rod 6 and acting through the lever 8 that tightening effort'secures the conical sleeves 12 against rotation from the position in which the blade has been adjusted. It will be noted that the jaw members 14 are secured against rotation in the conical sleeves 12 by the lock nuts 17.

To adjust the angle of the blade 15 it is only necessary to slacken' the tightening rod 6 by means of the nut 10, and partially rotate the conical sleeves 12 to the desired adjustment for which purpose flats may be provided for a wrench across the larger end of each sleeve, as shown in Fig. 3, and on tightening the rod 6 the saw is secured in the adjusted position.

The frame is one which rigidly supports the saw, the connection toward the handle being integral with the frame 2 and the lever 8, which forms the outer support, is bifurcated to engage both sides of the end of the frame 2 adjacent the fulcrum with an ample bearing thereon, the tie rod 6 fitting at 9 between the open ends of the bifurcation.

WVe do not, however, desire to be confined to the particular construction of the saw frame as we regard the essential feature of the invention to be the conical support afforded each end connection of the saw blade, whereby the plane of the saw blade may be adjusted to any angle and secured in such Having now particularly described our the Saw, means for locking the threaded invention, We hereby declare that What we stem in the cone, each cone member fitting claim as new and desire to be protected in a corresponding conical bearing in the saw by Letters Patent, is: frame, and means for applying tension to '5 Means for connecting a hack-saw to its the saw blade through the cone bearings of 15 frame, said means c0mprising a member pinthe saw connection. connected to each end of the saw blade, each In testimony whereof we aifix our signaof said members having a threaded stem, av tures. cone axially threaded on each stem with EDWIN G. IRELAND. 10 the smaller dimension of the cone toward JOHN D. CLARK. 

